About: High-Tg, heat resistant epoxy-silica hybrids with a low content of silica generated by nonaqueous sol-gel process

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The epoxy-silica hybrids showing high Tg and thermal stability are prepared by the non-aqueous sol–gel process initiated with borontriflouride monoethylamine. Tetramethoxysilane (TMOS) is used as a precursor of silica and 3-glycidyloxypropyl trimethoxysilane as a coupling agent to strengthen the interphase interaction with an epoxy matrix. The basic factors governing the nonaqueous sol–gel process are studied in order to reveal the formation–structure–properties relationships and to optimize the hybrid composition as well as conditions of the nonaqueous synthesis. The formation of the hybrid, its structure, thermomechanical properties and thermal stability are followed by chemorheology experiments, NMR, DMA and TGA. The most efficient reinforcement of the epoxy network is achieved by the combination of both alkoxysilanes, showing synergy effects. The hybrids with a low content (10 wt %) of the in situ generated silica exhibit dramatic increase in Tg and the high modulus, 335 MPa, up to the temperature 300°C. The epoxy-silica hybrids showing high Tg and thermal stability are prepared by the non-aqueous sol–gel process initiated with borontriflouride monoethylamine. Tetramethoxysilane (TMOS) is used as a precursor of silica and 3-glycidyloxypropyl trimethoxysilane as a coupling agent to strengthen the interphase interaction with an epoxy matrix. The basic factors governing the nonaqueous sol–gel process are studied in order to reveal the formation–structure–properties relationships and to optimize the hybrid composition as well as conditions of the nonaqueous synthesis. The formation of the hybrid, its structure, thermomechanical properties and thermal stability are followed by chemorheology experiments, NMR, DMA and TGA. The most efficient reinforcement of the epoxy network is achieved by the combination of both alkoxysilanes, showing synergy effects. The hybrids with a low content (10 wt %) of the in situ generated silica exhibit dramatic increase in Tg and the high modulus, 335 MPa, up to the temperature 300°C. (en)
Title	High-Tg, heat resistant epoxy-silica hybrids with a low content of silica generated by nonaqueous sol-gel process High-Tg, heat resistant epoxy-silica hybrids with a low content of silica generated by nonaqueous sol-gel process (en)
skos:prefLabel	High-Tg, heat resistant epoxy-silica hybrids with a low content of silica generated by nonaqueous sol-gel process High-Tg, heat resistant epoxy-silica hybrids with a low content of silica generated by nonaqueous sol-gel process (en)
skos:notation	RIV/61389013:_____/14:00431458!RIV15-GA0-61389013
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP108/12/1459)
http://linked.open...iv/cisloPeriodika	20
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Kovářová, Jana Matějka, Libor Kobera, Libor Ponyrko, Sergii
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	19176
http://linked.open...ai/riv/idVysledku	RIV/61389013:_____/14:00431458
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	glass transition; mechanical properties; nanostructured polymers (en)
http://linked.open.../riv/klicoveSlovo	nanostructured polymers glass transition mechanical properties
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[B265CED003D4]
http://linked.open...i/riv/nazevZdroje	Journal of Applied Polymer Science
http://linked.open...in/vavai/riv/obor	CD
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Advanced smart polymer materials
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	131
http://linked.open...iv/tvurceVysledku	Kovářová, Jana Matějka, Libor Kobera, Libor Ponyrko, Sergii
http://linked.open...ain/vavai/riv/wos	000340239000018
issn	0021-8995
number of pages	10 (xsd:int)
http://bibframe.org/vocab/doi	10.1002/app.40899

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